Characteristic Raindrop Size Retrievals from Measurements of Differences in Vertical Doppler Velocities at Ka- and W-Band Radar Frequencies
Characteristic Raindrop Size Retrievals from Measurements of Differences in Vertical Doppler Velocities at Ka- and W-Band Radar Frequencies
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通过测量 Ka 和 W 波段雷达频率的垂直多普勒速度差异来反演特征雨滴尺寸
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发表时间：
2017
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通讯作者：
S. Matrosov
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作者：
S. Matrosov
本文分析了Ka波段（~35 GHz）和W波段（~94 GHz）雷达从平均垂直多普勒速度（DDV）差反演雨滴特征尺寸（如平均质量加权直径Dm）剖面的方法。这种反演方法对雷达校准误差、垂直空气运动和衰减效应不敏感。Dm-DDV关系是使用来自不同观测站点的液滴粒径分布（DSD）的长期测量结果得出的，并且不假设功能性DSD形状。使用这种方法的非纳米比亚检索被证明是可用的Dm范围约为0.5-2毫米，平均不确定性约为21%。潜在的检索模糊时发生较大的下降人口存在，可以避免使用Ka波段垂直多普勒速度阈值。检索的性能说明了使用一个长期的主要层状雨事件观察到的大气辐射测量（ARM）南方大P…
AbstractA Ka-band (~35 GHz) and W-band (~94 GHz) radar approach to retrieve profiles of characteristic raindrop sizes, such as mean mass-weighted drop diameters Dm, from measurements of the difference in the mean vertical Doppler velocities (DDV) is analyzed. This retrieval approach is insensitive to radar calibration errors, vertical air motions, and attenuation effects. The Dm–DDV relations are derived using long-term measurements of drop size distributions (DSDs) from different observational sites and do not assume a functional DSD shape. Unambiguous retrievals using this approach are shown to be available in the Dm range of approximately 0.5–2 mm, with average uncertainties of around 21%. Potential retrieval ambiguities occurring when larger drop populations exist can be avoided by using a Ka-band vertical Doppler velocity threshold. The performance of the retrievals is illustrated using a long predominantly stratiform rain event observed at the Atmospheric Radiation Measurement (ARM) Southern Great P...